ASME Code Case 181

(b) The reference reflector may be a V-notch (which must subsequently be
removed), an angle beam search unit acting as a reflector, or any other
reflector that will aid in accomplishing the transfer.
(c) When the transfer method is chosen as an alternative, it shall be used, at
the minimum
1)for sizes ≤ DN 50 (NPS 2), once in each 10 welded joints examined
2)for sizes > DN 50 and ≤ DN 450 (NPS 18), once in each 1.5 m (5 ft) of
welding examined
3)for sizes > DN 450, once for each welded joint examined
(d) Each type of material and each size and wall thickness shall be
considered separately in applying the transfer method. In addition, the
transfer method shall be used at least twice on each type of weld joint.
(e) The reference level for monitoring discontinuities shall be modified to
reflect the transfer correction when the transfer method is used.
Charlie Chong